【作者】 张顺峰； 胡瑞林； 董国伟；

【Author】 ZHANG Shunfeng;HU Ruilin;DONG Guowei;Shenhua Geological Exploration Co.Ltd.;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences;

【机构】 神华地质勘查有限责任公司； 中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室；

【摘要】 神农溪下游碳酸岩分布广泛,岩溶作用强烈,对经过该区域的宜巴高速公路建设项目具有重要影响。本文通过对公路舒家槽段进行现场调查,结合物探、钻探勘察资料,对该段岩溶发育规律进行了研究,指出岩溶发育主要受地层岩性、地形条件及新构造运动控制,地表岩溶形态多样,地下岩溶洞隙发育,其具体规律表现为:(1)地表岩溶发育强度从山顶到沟谷依次增强,槽谷中岩溶发育深度差异大,从几米到上百米不等;洼地、漏斗等大型地表岩溶形态在平面上呈带状分布;双沟及多沟交汇处溶洼、溶斗发育,岩溶作用强烈。(2)溶洞及岩溶管道在垂直方向上可划分为4层,高程分别为0~50m、150~170m、220~250m和310m。在此基础上,指出了岩溶顶板稳定性、岩溶塌陷及路基不均匀沉降是公路建设中的主要工程地质问题,须采取相应措施。更多还原

【Abstract】 In the lower of Shennong river,it is widely covered by carbonatite with strong karstification,which has important influence on the construction of the Yiba highway.This paper takes Shujiacao area for example,researches on the karst development feature by in-site investigation and the data of geophysical prospecting and drilling.The results indicate that karst development is mainly controlled by formation lithology,topography and neoteetonics.The surface karst morphyology is multiple,and the underground karst cave and grike are development.The concrete development features are showed as below:(1) The surface karst becomes stronger from hill to valley,and the karst development depth is changed from several meters to hundred meters;the surface large karst morphology such as depression,doline etc.occur in the band distribution horizontally;depression and sinkhole are well developed at the intersection of valleys.(2)The caves and karst pipelines have four levels vertically,the elevation is 150~170 m、220~250 m and 310 m respectively.At the same time,a mount of covered cave and karst pipelines are found in the Shujiacao valley.On the research above,the authors point out that stability of cave roof under bridge pile,covered karst collapse and different settlement of subgrade is the main engineering geological problems which have to take corresponding measures in the process of highway construction.更多还原